[PATCH] powerpc: Use swapper_pg_dir instead of init_mm->pgd

init_mm->pgd is always swapper_pg_dir[] which is known
at build time.

Directly use the later instead of loading it from init_mm
struct at every time.

Signed-off-by: Christophe Leroy <redacted>
---
 arch/powerpc/include/asm/pgtable.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h
index 283f40d05a4d..f6843e6294d9 100644
--- a/arch/powerpc/include/asm/pgtable.h
+++ b/arch/powerpc/include/asm/pgtable.h

@@ -48,6 +48,9 @@ struct mm_struct;
 /* Keep these as a macros to avoid include dependency mess */
 #define pte_page(x)		pfn_to_page(pte_pfn(x))
 #define mk_pte(page, pgprot)	pfn_pte(page_to_pfn(page), (pgprot))
+
+#define pgd_offset_k(address)		pgd_offset_pgd(swapper_pg_dir, (address))
+
 /*
  * Select all bits except the pfn
  */

-- 
2.37.1

Le 09/10/2022 à 19:31, Christophe Leroy a écrit :

init_mm->pgd is always swapper_pg_dir[] which is known
at build time.

Directly use the later instead of loading it from init_mm
struct at every time.

Signed-off-by: Christophe Leroy <redacted>

Dropping this patch after feedback from Michael:

no other arches do it. (swapper_pg_dir)

It would also make us the only arch other than ia64 (which is old and
probably going to get removed soon) defining pgd_offset_k().