diff mbox series

[tip:x86/mm,v3,3/3] x86/mm: Cleanup prctl_enable_tagged_addr() nr_bits error checking

Message ID 20240418012835.3360429-3-yosryahmed@google.com (mailing list archive)
State New
Headers show
Series [tip:x86/mm,v3,1/3] x86/mm: Use IPIs to synchronize LAM enablement | expand

Commit Message

Yosry Ahmed April 18, 2024, 1:28 a.m. UTC 
There are two separate checks in prctl_enable_tagged_addr() that nr_bits
is in the correct range. The checks are arranged such the correct case
is sandwiched between both error cases, which do exactly the same thing.

Simplify the if condition and pull the correct case outside with the
rest of the success code path.

Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 arch/x86/kernel/process_64.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index cda2918f88f99..baded5b4907c9 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -831,17 +831,13 @@  static int prctl_enable_tagged_addr(struct mm_struct *mm, unsigned long nr_bits)
 		return -EBUSY;
 	}
 
-	if (!nr_bits) {
-		mmap_write_unlock(mm);
-		return -EINVAL;
-	} else if (nr_bits <= LAM_U57_BITS) {
-		mm->context.lam_cr3_mask = X86_CR3_LAM_U57;
-		mm->context.untag_mask =  ~GENMASK(62, 57);
-	} else {
+	if (!nr_bits || nr_bits > LAM_U57_BITS) {
 		mmap_write_unlock(mm);
 		return -EINVAL;
 	}
 
+	mm->context.lam_cr3_mask = X86_CR3_LAM_U57;
+	mm->context.untag_mask =  ~GENMASK(62, 57);
 	on_each_cpu_mask(mm_cpumask(mm), enable_lam_func, mm, true);
 	set_bit(MM_CONTEXT_LOCK_LAM, &mm->context.flags);