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powerpc/lib/feature-fixups: use raw_patch_instruction()

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commit 8183d99f4a upstream.

feature fixups need to use patch_instruction() early in the boot,
even before the code is relocated to its final address, requiring
patch_instruction() to use PTRRELOC() in order to address data.

But feature fixups applies on code before it is set to read only,
even for modules. Therefore, feature fixups can use
raw_patch_instruction() instead.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reported-by: David Gounaris <david.gounaris@infinera.com>
Tested-by: David Gounaris <david.gounaris@infinera.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christophe Leroy
2017-11-24 08:31:09 +01:00
committed by Greg Kroah-Hartman
parent f78ae314c6
commit e261faa2ec
3 changed files with 7 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
arch/powerpc/include/asm/code-patching.h
View File

@@ -31,6 +31,7 @@ unsigned int create_cond_branch(const unsigned int *addr,
unsigned long target, int flags);
int patch_branch(unsigned int *addr, unsigned long target, int flags);
int patch_instruction(unsigned int *addr, unsigned int instr);
int raw_patch_instruction(unsigned int *addr, unsigned int instr);
int instr_is_relative_branch(unsigned int instr);
int instr_is_relative_link_branch(unsigned int instr);

4
arch/powerpc/lib/code-patching.c
View File

@@ -39,7 +39,7 @@ static int __patch_instruction(unsigned int *exec_addr, unsigned int instr,
return 0;
}
static int raw_patch_instruction(unsigned int *addr, unsigned int instr)
int raw_patch_instruction(unsigned int *addr, unsigned int instr)
{
return __patch_instruction(addr, instr, addr);
}
@@ -156,7 +156,7 @@ static int do_patch_instruction(unsigned int *addr, unsigned int instr)
* when text_poke_area is not ready, but we still need
* to allow patching. We just do the plain old patching
*/
if (!this_cpu_read(*PTRRELOC(&text_poke_area)))
if (!this_cpu_read(text_poke_area))
return raw_patch_instruction(addr, instr);
local_irq_save(flags);

8
arch/powerpc/lib/feature-fixups.c
View File

@@ -63,7 +63,7 @@ static int patch_alt_instruction(unsigned int *src, unsigned int *dest,
}
}
patch_instruction(dest, instr);
raw_patch_instruction(dest, instr);
return 0;
}
@@ -92,7 +92,7 @@ static int patch_feature_section(unsigned long value, struct fixup_entry *fcur)
}
for (; dest < end; dest++)
patch_instruction(dest, PPC_INST_NOP);
raw_patch_instruction(dest, PPC_INST_NOP);
return 0;
}
@@ -292,7 +292,7 @@ void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end)
for (; start < end; start++) {
dest = (void *)start + *start;
patch_instruction(dest, PPC_INST_LWSYNC);
raw_patch_instruction(dest, PPC_INST_LWSYNC);
}
}
@@ -310,7 +310,7 @@ static void do_final_fixups(void)
length = (__end_interrupts - _stext) / sizeof(int);
while (length--) {
patch_instruction(dest, *src);
raw_patch_instruction(dest, *src);
src++;
dest++;
}