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arm64: kexec: skip relocation code for inplace kexec

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In case of kdump or when segments are already in place the relocation
is not needed, therefore the setup of relocation function and call to
it can be skipped.

Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Suggested-by: James Morse <james.morse@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20210930143113.1502553-6-pasha.tatashin@soleen.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Pasha Tatashin
2021-09-30 14:31:03 +00:00
committed by Will Deacon
parent 0d8732e461
commit 5bb6834fc2
2 changed files with 21 additions and 16 deletions
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3
arch/arm64/kernel/relocate_kernel.S
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@@ -32,8 +32,6 @@ SYM_CODE_START(arm64_relocate_new_kernel)
mov x16, x0 /* x16 = kimage_head */
mov x14, xzr /* x14 = entry ptr */
mov x13, xzr /* x13 = copy dest */
/* Check if the new image needs relocation. */
tbnz x16, IND_DONE_BIT, .Ldone
raw_dcache_line_size x15, x1 /* x15 = dcache line size */
.Lloop:
and x12, x16, PAGE_MASK /* x12 = addr */
@@ -65,7 +63,6 @@ SYM_CODE_START(arm64_relocate_new_kernel)
.Lnext:
ldr x16, [x14], #8 /* entry = *ptr++ */
tbz x16, IND_DONE_BIT, .Lloop /* while (!(entry & DONE)) */
.Ldone:
/* wait for writes from copy_page to finish */
dsb nsh
ic iallu