This is a note to let you know that I've just added the patch titled powerpc: Don't provide __kernel_map_pages() without ARCH_SUPPORTS_DEBUG_PAGEALLOC to the 5.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: powerpc-don-t-provide-__kernel_map_pages-without-arc.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 6c0b834972fdfa18b9a51ae3cde425c7357df42f Author: Christophe Leroy <christophe.leroy@xxxxxxxxxx> Date: Thu Oct 28 14:59:15 2021 +0200 powerpc: Don't provide __kernel_map_pages() without ARCH_SUPPORTS_DEBUG_PAGEALLOC [ Upstream commit f8c0e36b48e32b14bb83332d24e0646acd31d9e9 ] When ARCH_SUPPORTS_DEBUG_PAGEALLOC is not selected, the user can still select CONFIG_DEBUG_PAGEALLOC in which case __kernel_map_pages() is provided by mm/page_poison.c So only define __kernel_map_pages() when both CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC and CONFIG_DEBUG_PAGEALLOC are defined. Fixes: 68b44f94d637 ("powerpc/booke: Disable STRICT_KERNEL_RWX, DEBUG_PAGEALLOC and KFENCE") Reported-by: kernel test robot <lkp@xxxxxxxxx> Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx> Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/971b69739ff4746252e711a9845210465c023a9e.1635425947.git.christophe.leroy@xxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c index dcf5ecca19d99..fde1ed445ca46 100644 --- a/arch/powerpc/mm/pgtable_32.c +++ b/arch/powerpc/mm/pgtable_32.c @@ -173,7 +173,7 @@ void mark_rodata_ro(void) } #endif -#ifdef CONFIG_DEBUG_PAGEALLOC +#if defined(CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC) && defined(CONFIG_DEBUG_PAGEALLOC) void __kernel_map_pages(struct page *page, int numpages, int enable) { unsigned long addr = (unsigned long)page_address(page);