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powerpc/code-patching: Reorganise do_patch_instruction() to ease error handling

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Split do_patch_instruction() in two functions, the caller doing the
spin locking and the callee doing everything else.

And remove a few unnecessary initialisations and intermediate
variables.

This allows the callee to return from anywhere in the function.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/dbc85980a0d2a935731b272e8907e8bb1d8fc8c5.1638446239.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-12-02 13:00:21 +01:00 committed by Michael Ellerman
parent a3483c3dd1
commit 6b21af7449
1 changed files with 21 additions and 16 deletions
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37
arch/powerpc/lib/code-patching.c
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@ -129,13 +129,30 @@ static void unmap_patch_area(unsigned long addr)
flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
}
static int __do_patch_instruction(u32 *addr, ppc_inst_t instr)
{
int err;
u32 *patch_addr;
unsigned long text_poke_addr;
text_poke_addr = (unsigned long)__this_cpu_read(text_poke_area)->addr;
patch_addr = (u32 *)(text_poke_addr + offset_in_page(addr));
err = map_patch_area(addr, text_poke_addr);
if (err)
return err;
err = __patch_instruction(addr, instr, patch_addr);
unmap_patch_area(text_poke_addr);
return err;
}
static int do_patch_instruction(u32 *addr, ppc_inst_t instr)
{
int err;
u32 *patch_addr = NULL;
unsigned long flags;
unsigned long text_poke_addr;
unsigned long kaddr = (unsigned long)addr;
/*
* During early early boot patch_instruction is called
@ -146,19 +163,7 @@ static int do_patch_instruction(u32 *addr, ppc_inst_t instr)
return raw_patch_instruction(addr, instr);
local_irq_save(flags);
text_poke_addr = (unsigned long)__this_cpu_read(text_poke_area)->addr;
err = map_patch_area(addr, text_poke_addr);
if (err)
goto out;
patch_addr = (u32 *)(text_poke_addr + (kaddr & ~PAGE_MASK));
err = __patch_instruction(addr, instr, patch_addr);
unmap_patch_area(text_poke_addr);
out:
err = __do_patch_instruction(addr, instr);
local_irq_restore(flags);
return err;