linux-kernel - [PATCH v4 03/13] powerpc: Use 'struct func_desc' instead of 'struct ppc64_opd

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Date:   Tue, 15 Feb 2022 13:40:58 +0100
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Helge Deller <deller@....de>, Arnd Bergmann <arnd@...db.de>,
        Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-ia64@...r.kernel.org, linux-parisc@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-mm@...ck.org,
        Daniel Axtens <dja@...ens.net>,
        Nicholas Piggin <npiggin@...il.com>
Subject: [PATCH v4 03/13] powerpc: Use 'struct func_desc' instead of 'struct ppc64_opd_entry'

'struct ppc64_opd_entry' is somehow redundant with 'struct func_desc',
the later is more correct/complete as it includes the third
field which is unused.

So use 'struct func_desc' instead of 'struct ppc64_opd_entry'

Reviewed-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Daniel Axtens <dja@...ens.net>
Reviewed-by: Nicholas Piggin <npiggin@...il.com>
Signed-off-by: Christophe Leroy <christophe.leroy@...roup.eu>
---
 arch/powerpc/include/asm/sections.h |  4 ++--
 arch/powerpc/kernel/module_64.c     | 10 +++++-----
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/arch/powerpc/include/asm/sections.h b/arch/powerpc/include/asm/sections.h
index 38f79e42bf3c..baca39f4c6d3 100644
--- a/arch/powerpc/include/asm/sections.h
+++ b/arch/powerpc/include/asm/sections.h
@@ -61,10 +61,10 @@ static inline int overlaps_kernel_text(unsigned long start, unsigned long end)
 #undef dereference_function_descriptor
 static inline void *dereference_function_descriptor(void *ptr)
 {
-	struct ppc64_opd_entry *desc = ptr;
+	struct func_desc *desc = ptr;
 	void *p;
 
-	if (!get_kernel_nofault(p, (void *)&desc->funcaddr))
+	if (!get_kernel_nofault(p, (void *)&desc->addr))
 		ptr = p;
 	return ptr;
 }
diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c
index 6a45e6ddbe58..46e8eeb7c432 100644
--- a/arch/powerpc/kernel/module_64.c
+++ b/arch/powerpc/kernel/module_64.c
@@ -64,19 +64,19 @@ static unsigned int local_entry_offset(const Elf64_Sym *sym)
 #else
 
 /* An address is address of the OPD entry, which contains address of fn. */
-typedef struct ppc64_opd_entry func_desc_t;
+typedef struct func_desc func_desc_t;
 
 static func_desc_t func_desc(unsigned long addr)
 {
-	return *(struct ppc64_opd_entry *)addr;
+	return *(struct func_desc *)addr;
 }
 static unsigned long func_addr(unsigned long addr)
 {
-	return func_desc(addr).funcaddr;
+	return func_desc(addr).addr;
 }
 static unsigned long stub_func_addr(func_desc_t func)
 {
-	return func.funcaddr;
+	return func.addr;
 }
 static unsigned int local_entry_offset(const Elf64_Sym *sym)
 {
@@ -187,7 +187,7 @@ static int relacmp(const void *_x, const void *_y)
 static unsigned long get_stubs_size(const Elf64_Ehdr *hdr,
 				    const Elf64_Shdr *sechdrs)
 {
-	/* One extra reloc so it's always 0-funcaddr terminated */
+	/* One extra reloc so it's always 0-addr terminated */
 	unsigned long relocs = 1;
 	unsigned i;
 
-- 
2.34.1