From fcce1c6cb156d79debaf84f63233f146540031b1 Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Wed, 26 Jul 2023 16:11:43 -0700 Subject: [PATCH] x86/paravirt: Fix tlb_remove_table function callback prototype warning Under W=1, this warning is visible in Clang 16 and newer: arch/x86/kernel/paravirt.c:337:4: warning: cast from 'void (*)(struct mmu_gather *, struct page *)' to 'void (*)(struct mmu_gather *, void *)' converts to incompatible function type [-Wcast-function-type-strict] (void (*)(struct mmu_gather *, void *))tlb_remove_page, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Add a direct wrapper instead, which will make this warning (and potential KCFI failures) go away. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202307260332.pJntWR6o-lkp@intel.com/ Cc: Juergen Gross Cc: Peter Zijlstra Cc: Sami Tolvanen Cc: Nathan Chancellor Cc: Ajay Kaher Cc: Alexey Makhalov Cc: VMware PV-Drivers Reviewers Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: virtualization@lists.linux-foundation.org Reviewed-by: Juergen Gross Link: https://lore.kernel.org/r/20230726231139.never.601-kees@kernel.org Signed-off-by: Kees Cook --- arch/x86/kernel/paravirt.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c index ac10b46c5832..23d4d7114473 100644 --- a/arch/x86/kernel/paravirt.c +++ b/arch/x86/kernel/paravirt.c @@ -79,6 +79,11 @@ void __init native_pv_lock_init(void) static_branch_disable(&virt_spin_lock_key); } +static void native_tlb_remove_table(struct mmu_gather *tlb, void *table) +{ + tlb_remove_page(tlb, table); +} + unsigned int paravirt_patch(u8 type, void *insn_buff, unsigned long addr, unsigned int len) { @@ -295,8 +300,7 @@ struct paravirt_patch_template pv_ops = { .mmu.flush_tlb_kernel = native_flush_tlb_global, .mmu.flush_tlb_one_user = native_flush_tlb_one_user, .mmu.flush_tlb_multi = native_flush_tlb_multi, - .mmu.tlb_remove_table = - (void (*)(struct mmu_gather *, void *))tlb_remove_page, + .mmu.tlb_remove_table = native_tlb_remove_table, .mmu.exit_mmap = paravirt_nop, .mmu.notify_page_enc_status_changed = paravirt_nop,