From: Zishun Yi Date: Sun, 22 Mar 2026 16:00:22 +0000 (+0800) Subject: riscv: Reset pmm when PR_TAGGED_ADDR_ENABLE is not set X-Git-Tag: v7.0-rc7~1^2~3 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=3033b2b1e3949274f33a140e2a97571b5a307298;p=thirdparty%2Flinux.git riscv: Reset pmm when PR_TAGGED_ADDR_ENABLE is not set In set_tagged_addr_ctrl(), when PR_TAGGED_ADDR_ENABLE is not set, pmlen is correctly set to 0, but it forgets to reset pmm. This results in the CPU pmm state not corresponding to the software pmlen state. Fix this by resetting pmm along with pmlen. Fixes: 2e1743085887 ("riscv: Add support for the tagged address ABI") Signed-off-by: Zishun Yi Reviewed-by: Samuel Holland Link: https://patch.msgid.link/20260322160022.21908-1-vulab@iscas.ac.cn Signed-off-by: Paul Walmsley --- diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c index aacb23978f93..5957effab57c 100644 --- a/arch/riscv/kernel/process.c +++ b/arch/riscv/kernel/process.c @@ -347,8 +347,10 @@ long set_tagged_addr_ctrl(struct task_struct *task, unsigned long arg) if (arg & PR_TAGGED_ADDR_ENABLE && (tagged_addr_disabled || !pmlen)) return -EINVAL; - if (!(arg & PR_TAGGED_ADDR_ENABLE)) + if (!(arg & PR_TAGGED_ADDR_ENABLE)) { pmlen = PMLEN_0; + pmm = ENVCFG_PMM_PMLEN_0; + } if (mmap_write_lock_killable(mm)) return -EINTR;