arm64: fixmap: Allow 256K early_ioremap() at any offset

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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>

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Yu Peng 2026-07-08 10:35:14 +08:00 • committed by Will Deacon

parent 977f52909c

commit 21fc7ec93f

1 changed files with 5 additions and 1 deletions

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arch/arm64/include/asm/fixmap.h

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