From: Ard Biesheuvel <ardb@kernel.org> mainline inclusion from mainline-5.11-rc1 commit 3bcf906b194cebb6817cbb2f07b69e12aa5d7f51 category: feature issue: #I3ZXZF CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... ------------------------------------------------- Replace the open coded arithmetic with a simple adr_l/sub pair. This removes some open coded arithmetic involving virtual addresses, avoids literal pools on v7+, and slightly reduces the footprint of the code. Reviewed-by: Nicolas Pitre <nico@fluxnic.net> Signed-off-by: Ard Biesheuvel <ardb@kernel.org> (cherry picked from commit 3bcf906b194cebb6817cbb2f07b69e12aa5d7f51) Signed-off-by: Zhao Hongjiang <zhaohongjiang@huawei.com> Acked-by: Xie XiuQi <xiexiuqi@huawei.com> Signed-off-by: Chen Jun <chenjun102@huawei.com> Signed-off-by: Yu Changchun <yuchangchun1@huawei.com> --- arch/arm/kernel/head.S | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-) diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S index 7adab03a31bc..7f62c5eccdf3 100644 --- a/arch/arm/kernel/head.S +++ b/arch/arm/kernel/head.S @@ -103,10 +103,8 @@ ENTRY(stext) #endif #ifndef CONFIG_XIP_KERNEL - adr r3, 2f - ldmia r3, {r4, r8} - sub r4, r3, r4 @ (PHYS_OFFSET - PAGE_OFFSET) - add r8, r8, r4 @ PHYS_OFFSET + adr_l r8, _text @ __pa(_text) + sub r8, r8, #TEXT_OFFSET @ PHYS_OFFSET #else ldr r8, =PLAT_PHYS_OFFSET @ always constant in this case #endif @@ -158,10 +156,6 @@ ENTRY(stext) 1: b __enable_mmu ENDPROC(stext) .ltorg -#ifndef CONFIG_XIP_KERNEL -2: .long . - .long PAGE_OFFSET -#endif /* * Setup the initial page tables. We only setup the barest -- 2.22.0