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powerpc/code-patching: Remove #ifdef CONFIG_STRICT_KERNEL_RWX

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No need to have one implementation of patch_instruction() for
CONFIG_STRICT_KERNEL_RWX and one for !CONFIG_STRICT_KERNEL_RWX.

In patch_instruction(), call raw_patch_instruction() when
!CONFIG_STRICT_KERNEL_RWX.

In poking_init(), bail out immediately, it will be equivalent
to the weak default implementation.

Everything else is declared static and will be discarded by
GCC when !CONFIG_STRICT_KERNEL_RWX.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/f67d2a109404d03e8fdf1ea15388c8778337a76b.1669969781.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2022-12-02 09:31:39 +01:00 committed by Michael Ellerman
parent ad050d2390
commit 84ecfe6f38
1 changed files with 5 additions and 11 deletions
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16
arch/powerpc/lib/code-patching.c
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@ -46,8 +46,6 @@ int raw_patch_instruction(u32 *addr, ppc_inst_t instr)
return __patch_instruction(addr, instr, addr);
}
#ifdef CONFIG_STRICT_KERNEL_RWX
struct patch_context {
union {
struct vm_struct *area;
@ -208,6 +206,9 @@ void __init poking_init(void)
{
int ret;
if (!IS_ENABLED(CONFIG_STRICT_KERNEL_RWX))
return;
if (mm_patch_enabled())
ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
"powerpc/text_poke_mm:online",
@ -358,7 +359,8 @@ static int do_patch_instruction(u32 *addr, ppc_inst_t instr)
* when text_poke_area is not ready, but we still need
* to allow patching. We just do the plain old patching
*/
if (!static_branch_likely(&poking_init_done))
if (!IS_ENABLED(CONFIG_STRICT_KERNEL_RWX) ||
!static_branch_likely(&poking_init_done))
return raw_patch_instruction(addr, instr);
local_irq_save(flags);
@ -370,14 +372,6 @@ static int do_patch_instruction(u32 *addr, ppc_inst_t instr)
return err;
}
#else /* !CONFIG_STRICT_KERNEL_RWX */
static int do_patch_instruction(u32 *addr, ppc_inst_t instr)
{
return raw_patch_instruction(addr, instr);
}
#endif /* CONFIG_STRICT_KERNEL_RWX */
__ro_after_init DEFINE_STATIC_KEY_FALSE(init_mem_is_free);