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 <l...@intel.com>
Closes:
https://lore.kernel.org/oe-kbuild-all/202307260332.pjntwr6o-...@intel.com/
Cc: Juergen Gross <jgr...@suse.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Sami Tolvanen <samitolva...@google.com>
Cc: Nathan Chancellor <nat...@kernel.org>
Cc: Ajay Kaher <aka...@vmware.com>
Cc: Alexey Makhalov <amakha...@vmware.com>
Cc: VMware PV-Drivers Reviewers <pv-driv...@vmware.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: Borislav Petkov <b...@alien8.de>
Cc: Dave Hansen <dave.han...@linux.intel.com>
Cc: virtualization@lists.linux-foundation.org
Signed-off-by: Kees Cook <keesc...@chromium.org>
---
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,
--
2.34.1
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