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Message-Id: <20171227085033.22389-7-ard.biesheuvel@linaro.org> Date: Wed, 27 Dec 2017 08:50:31 +0000 From: Ard Biesheuvel <ard.biesheuvel@...aro.org> To: linux-kernel@...r.kernel.org Cc: Ard Biesheuvel <ard.biesheuvel@...aro.org>, "H. Peter Anvin" <hpa@...or.com>, Ralf Baechle <ralf@...ux-mips.org>, Arnd Bergmann <arnd@...db.de>, Heiko Carstens <heiko.carstens@...ibm.com>, Kees Cook <keescook@...omium.org>, Will Deacon <will.deacon@....com>, Michael Ellerman <mpe@...erman.id.au>, Thomas Garnier <thgarnie@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, "Serge E. Hallyn" <serge@...lyn.com>, Bjorn Helgaas <bhelgaas@...gle.com>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Russell King <linux@...linux.org.uk>, Paul Mackerras <paulus@...ba.org>, Catalin Marinas <catalin.marinas@....com>, "David S. Miller" <davem@...emloft.net>, Petr Mladek <pmladek@...e.com>, Ingo Molnar <mingo@...hat.com>, James Morris <james.l.morris@...cle.com>, Andrew Morton <akpm@...ux-foundation.org>, Nicolas Pitre <nico@...aro.org>, Josh Poimboeuf <jpoimboe@...hat.com>, Steven Rostedt <rostedt@...dmis.org>, Martin Schwidefsky <schwidefsky@...ibm.com>, Sergey Senozhatsky <sergey.senozhatsky@...il.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Jessica Yu <jeyu@...nel.org>, linux-arm-kernel@...ts.infradead.org, linux-mips@...ux-mips.org, linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org, sparclinux@...r.kernel.org, x86@...nel.org Subject: [PATCH v6 6/8] kernel/jump_label: abstract jump_entry member accessors In preparation of allowing architectures to use relative references in jump_label entries [which can dramatically reduce the memory footprint], introduce abstractions for references to the 'code' and 'key' members of struct jump_entry. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org> --- arch/arm/include/asm/jump_label.h | 27 ++++++++++++++ arch/arm64/include/asm/jump_label.h | 27 ++++++++++++++ arch/mips/include/asm/jump_label.h | 27 ++++++++++++++ arch/powerpc/include/asm/jump_label.h | 27 ++++++++++++++ arch/s390/include/asm/jump_label.h | 20 +++++++++++ arch/sparc/include/asm/jump_label.h | 27 ++++++++++++++ arch/tile/include/asm/jump_label.h | 27 ++++++++++++++ arch/x86/include/asm/jump_label.h | 27 ++++++++++++++ kernel/jump_label.c | 38 +++++++++----------- 9 files changed, 225 insertions(+), 22 deletions(-) diff --git a/arch/arm/include/asm/jump_label.h b/arch/arm/include/asm/jump_label.h index e12d7d096fc0..7b05b404063a 100644 --- a/arch/arm/include/asm/jump_label.h +++ b/arch/arm/include/asm/jump_label.h @@ -45,5 +45,32 @@ struct jump_entry { jump_label_t key; }; +static inline jump_label_t jump_entry_code(const struct jump_entry *entry) +{ + return entry->code; +} + +static inline struct static_key *jump_entry_key(const struct jump_entry *entry) +{ + return (struct static_key *)((unsigned long)entry->key & ~1UL); +} + +static inline bool jump_entry_is_branch(const struct jump_entry *entry) +{ + return (unsigned long)entry->key & 1UL; +} + +static inline bool jump_entry_is_module_init(const struct jump_entry *entry) +{ + return entry->code == 0; +} + +static inline void jump_entry_set_module_init(struct jump_entry *entry) +{ + entry->code = 0; +} + +#define jump_label_swap NULL + #endif /* __ASSEMBLY__ */ #endif diff --git a/arch/arm64/include/asm/jump_label.h b/arch/arm64/include/asm/jump_label.h index 1b5e0e843c3a..9d6e46355c89 100644 --- a/arch/arm64/include/asm/jump_label.h +++ b/arch/arm64/include/asm/jump_label.h @@ -62,5 +62,32 @@ struct jump_entry { jump_label_t key; }; +static inline jump_label_t jump_entry_code(const struct jump_entry *entry) +{ + return entry->code; +} + +static inline struct static_key *jump_entry_key(const struct jump_entry *entry) +{ + return (struct static_key *)((unsigned long)entry->key & ~1UL); +} + +static inline bool jump_entry_is_branch(const struct jump_entry *entry) +{ + return (unsigned long)entry->key & 1UL; +} + +static inline bool jump_entry_is_module_init(const struct jump_entry *entry) +{ + return entry->code == 0; +} + +static inline void jump_entry_set_module_init(struct jump_entry *entry) +{ + entry->code = 0; +} + +#define jump_label_swap NULL + #endif /* __ASSEMBLY__ */ #endif /* __ASM_JUMP_LABEL_H */ diff --git a/arch/mips/include/asm/jump_label.h b/arch/mips/include/asm/jump_label.h index e77672539e8e..70df9293dc49 100644 --- a/arch/mips/include/asm/jump_label.h +++ b/arch/mips/include/asm/jump_label.h @@ -66,5 +66,32 @@ struct jump_entry { jump_label_t key; }; +static inline jump_label_t jump_entry_code(const struct jump_entry *entry) +{ + return entry->code; +} + +static inline struct static_key *jump_entry_key(const struct jump_entry *entry) +{ + return (struct static_key *)((unsigned long)entry->key & ~1UL); +} + +static inline bool jump_entry_is_branch(const struct jump_entry *entry) +{ + return (unsigned long)entry->key & 1UL; +} + +static inline bool jump_entry_is_module_init(const struct jump_entry *entry) +{ + return entry->code == 0; +} + +static inline void jump_entry_set_module_init(struct jump_entry *entry) +{ + entry->code = 0; +} + +#define jump_label_swap NULL + #endif /* __ASSEMBLY__ */ #endif /* _ASM_MIPS_JUMP_LABEL_H */ diff --git a/arch/powerpc/include/asm/jump_label.h b/arch/powerpc/include/asm/jump_label.h index 9a287e0ac8b1..412b2699c9f6 100644 --- a/arch/powerpc/include/asm/jump_label.h +++ b/arch/powerpc/include/asm/jump_label.h @@ -59,6 +59,33 @@ struct jump_entry { jump_label_t key; }; +static inline jump_label_t jump_entry_code(const struct jump_entry *entry) +{ + return entry->code; +} + +static inline struct static_key *jump_entry_key(const struct jump_entry *entry) +{ + return (struct static_key *)((unsigned long)entry->key & ~1UL); +} + +static inline bool jump_entry_is_branch(const struct jump_entry *entry) +{ + return (unsigned long)entry->key & 1UL; +} + +static inline bool jump_entry_is_module_init(const struct jump_entry *entry) +{ + return entry->code == 0; +} + +static inline void jump_entry_set_module_init(struct jump_entry *entry) +{ + entry->code = 0; +} + +#define jump_label_swap NULL + #else #define ARCH_STATIC_BRANCH(LABEL, KEY) \ 1098: nop; \ diff --git a/arch/s390/include/asm/jump_label.h b/arch/s390/include/asm/jump_label.h index 40f651292aa7..3d4a08e9514b 100644 --- a/arch/s390/include/asm/jump_label.h +++ b/arch/s390/include/asm/jump_label.h @@ -50,5 +50,25 @@ struct jump_entry { jump_label_t key; }; +static inline jump_label_t jump_entry_code(const struct jump_entry *entry) +{ + return entry->code; +} + +static inline jump_label_t jump_entry_key(const struct jump_entry *entry) +{ + return entry->key; +} + +static inline bool jump_entry_is_module_init(const struct jump_entry *entry) +{ + return entry->code == 0; +} + +static inline void jump_entry_set_module_init(struct jump_entry *entry) +{ + entry->code = 0; +} + #endif /* __ASSEMBLY__ */ #endif diff --git a/arch/sparc/include/asm/jump_label.h b/arch/sparc/include/asm/jump_label.h index 94eb529dcb77..18e893687f7c 100644 --- a/arch/sparc/include/asm/jump_label.h +++ b/arch/sparc/include/asm/jump_label.h @@ -48,5 +48,32 @@ struct jump_entry { jump_label_t key; }; +static inline jump_label_t jump_entry_code(const struct jump_entry *entry) +{ + return entry->code; +} + +static inline struct static_key *jump_entry_key(const struct jump_entry *entry) +{ + return (struct static_key *)((unsigned long)entry->key & ~1UL); +} + +static inline bool jump_entry_is_branch(const struct jump_entry *entry) +{ + return (unsigned long)entry->key & 1UL; +} + +static inline bool jump_entry_is_module_init(const struct jump_entry *entry) +{ + return entry->code == 0; +} + +static inline void jump_entry_set_module_init(struct jump_entry *entry) +{ + entry->code = 0; +} + +#define jump_label_swap NULL + #endif /* __ASSEMBLY__ */ #endif diff --git a/arch/tile/include/asm/jump_label.h b/arch/tile/include/asm/jump_label.h index cde7573f397b..86acaa6ff33d 100644 --- a/arch/tile/include/asm/jump_label.h +++ b/arch/tile/include/asm/jump_label.h @@ -55,4 +55,31 @@ struct jump_entry { jump_label_t key; }; +static inline jump_label_t jump_entry_code(const struct jump_entry *entry) +{ + return entry->code; +} + +static inline struct static_key *jump_entry_key(const struct jump_entry *entry) +{ + return (struct static_key *)((unsigned long)entry->key & ~1UL); +} + +static inline bool jump_entry_is_branch(const struct jump_entry *entry) +{ + return (unsigned long)entry->key & 1UL; +} + +static inline bool jump_entry_is_module_init(const struct jump_entry *entry) +{ + return entry->code == 0; +} + +static inline void jump_entry_set_module_init(struct jump_entry *entry) +{ + entry->code = 0; +} + +#define jump_label_swap NULL + #endif /* _ASM_TILE_JUMP_LABEL_H */ diff --git a/arch/x86/include/asm/jump_label.h b/arch/x86/include/asm/jump_label.h index 8c0de4282659..009ff2699d07 100644 --- a/arch/x86/include/asm/jump_label.h +++ b/arch/x86/include/asm/jump_label.h @@ -74,6 +74,33 @@ struct jump_entry { jump_label_t key; }; +static inline jump_label_t jump_entry_code(const struct jump_entry *entry) +{ + return entry->code; +} + +static inline struct static_key *jump_entry_key(const struct jump_entry *entry) +{ + return (struct static_key *)((unsigned long)entry->key & ~1UL); +} + +static inline bool jump_entry_is_branch(const struct jump_entry *entry) +{ + return (unsigned long)entry->key & 1UL; +} + +static inline bool jump_entry_is_module_init(const struct jump_entry *entry) +{ + return entry->code == 0; +} + +static inline void jump_entry_set_module_init(struct jump_entry *entry) +{ + entry->code = 0; +} + +#define jump_label_swap NULL + #else /* __ASSEMBLY__ */ .macro STATIC_JUMP_IF_TRUE target, key, def diff --git a/kernel/jump_label.c b/kernel/jump_label.c index 8594d24e4adc..4f44db58d981 100644 --- a/kernel/jump_label.c +++ b/kernel/jump_label.c @@ -37,10 +37,12 @@ static int jump_label_cmp(const void *a, const void *b) const struct jump_entry *jea = a; const struct jump_entry *jeb = b; - if (jea->key < jeb->key) + if ((unsigned long)jump_entry_key(jea) < + (unsigned long)jump_entry_key(jeb)) return -1; - if (jea->key > jeb->key) + if ((unsigned long)jump_entry_key(jea) > + (unsigned long)jump_entry_key(jeb)) return 1; return 0; @@ -53,7 +55,8 @@ jump_label_sort_entries(struct jump_entry *start, struct jump_entry *stop) size = (((unsigned long)stop - (unsigned long)start) / sizeof(struct jump_entry)); - sort(start, size, sizeof(struct jump_entry), jump_label_cmp, NULL); + sort(start, size, sizeof(struct jump_entry), jump_label_cmp, + jump_label_swap); } static void jump_label_update(struct static_key *key); @@ -254,8 +257,8 @@ EXPORT_SYMBOL_GPL(jump_label_rate_limit); static int addr_conflict(struct jump_entry *entry, void *start, void *end) { - if (entry->code <= (unsigned long)end && - entry->code + JUMP_LABEL_NOP_SIZE > (unsigned long)start) + if (jump_entry_code(entry) <= (unsigned long)end && + jump_entry_code(entry) + JUMP_LABEL_NOP_SIZE > (unsigned long)start) return 1; return 0; @@ -314,16 +317,6 @@ static inline void static_key_set_linked(struct static_key *key) key->type |= JUMP_TYPE_LINKED; } -static inline struct static_key *jump_entry_key(struct jump_entry *entry) -{ - return (struct static_key *)((unsigned long)entry->key & ~1UL); -} - -static bool jump_entry_branch(struct jump_entry *entry) -{ - return (unsigned long)entry->key & 1UL; -} - /*** * A 'struct static_key' uses a union such that it either points directly * to a table of 'struct jump_entry' or to a linked list of modules which in @@ -348,7 +341,7 @@ static enum jump_label_type jump_label_type(struct jump_entry *entry) { struct static_key *key = jump_entry_key(entry); bool enabled = static_key_enabled(key); - bool branch = jump_entry_branch(entry); + bool branch = jump_entry_is_branch(entry); /* See the comment in linux/jump_label.h */ return enabled ^ branch; @@ -364,7 +357,8 @@ static void __jump_label_update(struct static_key *key, * kernel_text_address() verifies we are not in core kernel * init code, see jump_label_invalidate_module_init(). */ - if (entry->code && kernel_text_address(entry->code)) + if (!jump_entry_is_module_init(entry) && + kernel_text_address(jump_entry_code(entry))) arch_jump_label_transform(entry, jump_label_type(entry)); } } @@ -417,7 +411,7 @@ static enum jump_label_type jump_label_init_type(struct jump_entry *entry) { struct static_key *key = jump_entry_key(entry); bool type = static_key_type(key); - bool branch = jump_entry_branch(entry); + bool branch = jump_entry_is_branch(entry); /* See the comment in linux/jump_label.h */ return type ^ branch; @@ -541,7 +535,7 @@ static int jump_label_add_module(struct module *mod) continue; key = iterk; - if (within_module(iter->key, mod)) { + if (within_module((unsigned long)key, mod)) { static_key_set_entries(key, iter); continue; } @@ -591,7 +585,7 @@ static void jump_label_del_module(struct module *mod) key = jump_entry_key(iter); - if (within_module(iter->key, mod)) + if (within_module((unsigned long)key, mod)) continue; /* No memory during module load */ @@ -634,8 +628,8 @@ static void jump_label_invalidate_module_init(struct module *mod) struct jump_entry *iter; for (iter = iter_start; iter < iter_stop; iter++) { - if (within_module_init(iter->code, mod)) - iter->code = 0; + if (within_module_init(jump_entry_code(iter), mod)) + jump_entry_set_module_init(iter); } } -- 2.11.0
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