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Message-ID: <87jz662ssp.fsf@gmail.com>
Date: Sat, 24 May 2025 16:13:02 +0530
From: Ritesh Harjani (IBM) <ritesh.list@...il.com>
To: Kees Cook <kees@...nel.org>, Arnd Bergmann <arnd@...db.de>
Cc: Kees Cook <kees@...nel.org>, Madhavan Srinivasan <maddy@...ux.ibm.com>,
Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
Christophe Leroy <christophe.leroy@...roup.eu>, Naveen N Rao <naveen@...nel.org>,
"Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>, Andrew Morton <akpm@...ux-foundation.org>,
linuxppc-dev@...ts.ozlabs.org, "Gustavo A. R. Silva" <gustavoars@...nel.org>,
Christoph Hellwig <hch@....de>, Marco Elver <elver@...gle.com>, Andrey Konovalov <andreyknvl@...il.com>,
Andrey Ryabinin <ryabinin.a.a@...il.com>, Ard Biesheuvel <ardb@...nel.org>,
Masahiro Yamada <masahiroy@...nel.org>, Nathan Chancellor <nathan@...nel.org>,
Nicolas Schier <nicolas.schier@...ux.dev>,
Nick Desaulniers <nick.desaulniers+lkml@...il.com>, Bill Wendling <morbo@...gle.com>,
Justin Stitt <justinstitt@...gle.com>, linux-kernel@...r.kernel.org, x86@...nel.org,
kasan-dev@...glegroups.com, linux-doc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org,
linux-efi@...r.kernel.org, linux-hardening@...r.kernel.org,
linux-kbuild@...r.kernel.org, linux-security-module@...r.kernel.org,
linux-kselftest@...r.kernel.org, sparclinux@...r.kernel.org,
llvm@...ts.linux.dev
Subject: Re: [PATCH v2 08/14] powerpc: Handle KCOV __init vs inline mismatches
Kees Cook <kees@...nel.org> writes:
> When KCOV is enabled all functions get instrumented, unless
> the __no_sanitize_coverage attribute is used. To prepare for
> __no_sanitize_coverage being applied to __init functions, we have to
> handle differences in how GCC's inline optimizations get resolved. For
> s390 this requires forcing a couple functions to be inline with
> __always_inline.
>
> Signed-off-by: Kees Cook <kees@...nel.org>
> ---
> Cc: Madhavan Srinivasan <maddy@...ux.ibm.com>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Nicholas Piggin <npiggin@...il.com>
> Cc: Christophe Leroy <christophe.leroy@...roup.eu>
> Cc: Naveen N Rao <naveen@...nel.org>
> Cc: "Ritesh Harjani (IBM)" <ritesh.list@...il.com>
> Cc: "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: <linuxppc-dev@...ts.ozlabs.org>
> ---
> arch/powerpc/mm/book3s64/hash_utils.c | 2 +-
> arch/powerpc/mm/book3s64/radix_pgtable.c | 2 +-
> 2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c
> index 5158aefe4873..93f1e1eb5ea6 100644
> --- a/arch/powerpc/mm/book3s64/hash_utils.c
> +++ b/arch/powerpc/mm/book3s64/hash_utils.c
> @@ -409,7 +409,7 @@ static DEFINE_RAW_SPINLOCK(linear_map_kf_hash_lock);
>
> static phys_addr_t kfence_pool;
>
> -static inline void hash_kfence_alloc_pool(void)
> +static __always_inline void hash_kfence_alloc_pool(void)
> {
> if (!kfence_early_init_enabled())
> goto err;
> diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
> index 9f764bc42b8c..3238e9ed46b5 100644
> --- a/arch/powerpc/mm/book3s64/radix_pgtable.c
> +++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
> @@ -363,7 +363,7 @@ static int __meminit create_physical_mapping(unsigned long start,
> }
>
> #ifdef CONFIG_KFENCE
> -static inline phys_addr_t alloc_kfence_pool(void)
> +static __always_inline phys_addr_t alloc_kfence_pool(void)
> {
> phys_addr_t kfence_pool;
>
I remember seeing a warning msg around .init.text section. Let me dig
that...
... Here it is: https://lore.kernel.org/oe-kbuild-all/202504190552.mnFGs5sj-lkp@intel.com/
I am not sure why it only complains for hash_debug_pagealloc_alloc_slots().
I believe there should me more functions to mark with __init here.
Anyways, here is the patch of what I had in mind.. I am not a compiler expert,
so please let me know your thoughts on this.
-ritesh
>From 59d64dc0014ccb4ae13ed08ab596738628ee23b1 Mon Sep 17 00:00:00 2001
Message-Id: <59d64dc0014ccb4ae13ed08ab596738628ee23b1.1748084756.git.ritesh.list@...il.com>
From: "Ritesh Harjani (IBM)" <ritesh.list@...il.com>
Date: Sat, 24 May 2025 16:14:08 +0530
Subject: [RFC] powerpc/mm/book3s64: Move few kfence & debug_pagealloc
related calls to __init section
Move few kfence and debug_pagealloc related functions in hash_utils.c
and radix_pgtable.c to __init sections since these are only invoked once
by an __init function during system initialization.
i.e.
- hash_debug_pagealloc_alloc_slots()
- hash_kfence_alloc_pool()
- hash_kfence_map_pool()
The above 3 functions only gets called by __init htab_initialize().
- alloc_kfence_pool()
- map_kfence_pool()
The above 2 functions only gets called by __init radix_init_pgtable()
This should also help fix warning msgs like:
>> WARNING: modpost: vmlinux: section mismatch in reference:
hash_debug_pagealloc_alloc_slots+0xb0 (section: .text) ->
memblock_alloc_try_nid (section: .init.text)
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202504190552.mnFGs5sj-lkp@intel.com/
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>
---
arch/powerpc/mm/book3s64/hash_utils.c | 6 +++---
arch/powerpc/mm/book3s64/radix_pgtable.c | 4 ++--
2 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c
index 5158aefe4873..4693c464fc5a 100644
--- a/arch/powerpc/mm/book3s64/hash_utils.c
+++ b/arch/powerpc/mm/book3s64/hash_utils.c
@@ -343,7 +343,7 @@ static inline bool hash_supports_debug_pagealloc(void)
static u8 *linear_map_hash_slots;
static unsigned long linear_map_hash_count;
static DEFINE_RAW_SPINLOCK(linear_map_hash_lock);
-static void hash_debug_pagealloc_alloc_slots(void)
+static __init void hash_debug_pagealloc_alloc_slots(void)
{
if (!hash_supports_debug_pagealloc())
return;
@@ -409,7 +409,7 @@ static DEFINE_RAW_SPINLOCK(linear_map_kf_hash_lock);
static phys_addr_t kfence_pool;
-static inline void hash_kfence_alloc_pool(void)
+static __init void hash_kfence_alloc_pool(void)
{
if (!kfence_early_init_enabled())
goto err;
@@ -445,7 +445,7 @@ static inline void hash_kfence_alloc_pool(void)
disable_kfence();
}
-static inline void hash_kfence_map_pool(void)
+static __init void hash_kfence_map_pool(void)
{
unsigned long kfence_pool_start, kfence_pool_end;
unsigned long prot = pgprot_val(PAGE_KERNEL);
diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
index 311e2112d782..ed226ee1569a 100644
--- a/arch/powerpc/mm/book3s64/radix_pgtable.c
+++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
@@ -363,7 +363,7 @@ static int __meminit create_physical_mapping(unsigned long start,
}
#ifdef CONFIG_KFENCE
-static inline phys_addr_t alloc_kfence_pool(void)
+static __init phys_addr_t alloc_kfence_pool(void)
{
phys_addr_t kfence_pool;
@@ -393,7 +393,7 @@ static inline phys_addr_t alloc_kfence_pool(void)
return 0;
}
-static inline void map_kfence_pool(phys_addr_t kfence_pool)
+static __init void map_kfence_pool(phys_addr_t kfence_pool)
{
if (!kfence_pool)
return;
--
2.39.5
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