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Sun, 11 Oct 2026 04:31:10 -0700 (PDT) Sender: Julian Braha From: Julian Braha To: maddy@linux.ibm.com Cc: mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org, ritesh.list@gmail.com, sshegde@linux.ibm.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Julian Braha Subject: [PATCH] powerpc/Kconfig: limit the PPC_85xx DATA_SHIFT range to STRICT_KERNEL_RWX Date: Sun, 11 Oct 2026 12:31:08 +0100 Message-ID: <20261011113108.539470-1-julianbraha@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On PPC_85xx, enabling DEBUG_PAGEALLOC without STRICT_KERNEL_RWX activates the DATA_SHIFT range of 20..24, but since the PAGE_SHIFT default is outside the range (12), kconfig adjusts it to 20, causing 1mb alignment instead of 4kb. However, the larger alignment is only needed for the separate kernel permissions provided by STRICT_KERNEL_RWX. Since PPC_85xx uses page poisoning for DEBUG_PAGEALLOC and does not support KFENCE, let's restrict this range to STRICT_KERNEL_RWX. This out-of-range default was detected by kconfirm, a static analysis tool for Kconfig. Signed-off-by: Julian Braha --- arch/powerpc/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index c3b6cd655606..5e2a4799438d 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -896,7 +896,7 @@ config DATA_SHIFT default 24 if STRICT_KERNEL_RWX && PPC64 range 17 28 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32 range 14 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx - range 20 24 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_85xx + range 20 24 if STRICT_KERNEL_RWX && PPC_85xx default 22 if STRICT_KERNEL_RWX && PPC_BOOK3S_32 default 18 if (DEBUG_PAGEALLOC || KFENCE) && PPC_BOOK3S_32 default 23 if (STRICT_KERNEL_RWX || DEBUG_PAGEALLOC || KFENCE) && PPC_8xx && \ -- 2.55.0