diff mbox series

[v8,6/6] powerpc/code-patching: Use CPU local patch address directly

Message ID 20221021052238.580986-7-bgray@linux.ibm.com (mailing list archive)
State Superseded
Headers show
Series Use per-CPU temporary mappings for patching | expand

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Commit Message

Benjamin Gray Oct. 21, 2022, 5:22 a.m. UTC 
With the isolated mm context support, there is a CPU local variable that
can hold the patch address. Use it instead of adding a level of
indirection through the text_poke_area vm_struct.

Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
---
 arch/powerpc/lib/code-patching.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c
index eabdd74a26c0..ce58c1b3fcf1 100644
--- a/arch/powerpc/lib/code-patching.c
+++ b/arch/powerpc/lib/code-patching.c
@@ -122,6 +122,7 @@  static int text_area_cpu_up(unsigned int cpu)
 	unmap_patch_area(addr);
 
 	this_cpu_write(text_poke_area, area);
+	this_cpu_write(cpu_patching_addr, addr);
 
 	return 0;
 }
@@ -365,7 +366,7 @@  static int __do_patch_instruction(u32 *addr, ppc_inst_t instr)
 	pte_t *pte;
 	unsigned long pfn = get_patch_pfn(addr);
 
-	text_poke_addr = (unsigned long)__this_cpu_read(text_poke_area)->addr & PAGE_MASK;
+	text_poke_addr = (unsigned long)__this_cpu_read(cpu_patching_addr) & PAGE_MASK;
 	patch_addr = (u32 *)(text_poke_addr + offset_in_page(addr));
 
 	pte = virt_to_kpte(text_poke_addr);