diff options
| author | Yu Peng <pengyu@kylinos.cn> | 2026-07-08 10:35:14 +0800 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2026-07-16 14:50:30 +0100 |
| commit | 21fc7ec93f8b633b60d5bddef2f1529ff6b36185 (patch) | |
| tree | 06ea173097a1190d36f8c5ad2edc4c829a6d5c61 | |
| parent | 977f52909c624210178a1247fab0b02b110c1106 (diff) | |
arm64: fixmap: Allow 256K early_ioremap() at any offset
NR_FIX_BTMAPS is the per-slot page limit for early_ioremap(). Since
__early_ioremap() maps the page-aligned physical range, a 256K request
can require one extra page when the physical address is not page-aligned.
Reserve one extra page per slot so the 256K mapping budget is usable
regardless of the initial page offset.
Link: https://lore.kernel.org/r/08fd96fa-ee3a-4904-bd11-bb08bd90436f@kylinos.cn
Signed-off-by: Yu Peng <pengyu@kylinos.cn>
Signed-off-by: Will Deacon <will@kernel.org>
| -rw-r--r-- | arch/arm64/include/asm/fixmap.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/fixmap.h b/arch/arm64/include/asm/fixmap.h index 65555284446e..7075a3bd2c61 100644 --- a/arch/arm64/include/asm/fixmap.h +++ b/arch/arm64/include/asm/fixmap.h @@ -78,8 +78,12 @@ enum fixed_addresses { /* * Temporary boot-time mappings, used by early_ioremap(), * before ioremap() is functional. + * + * Reserve one extra page so a 256K mapping may start at any + * offset within a page. early_ioremap() maps the page-aligned + * physical range, so the initial offset can consume an extra page. */ -#define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE) +#define NR_FIX_BTMAPS ((SZ_256K / PAGE_SIZE) + 1) #define FIX_BTMAPS_SLOTS 7 #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) |