git: fa77660a3ccb - main - pipe: Avoid unnecessary priv_check() calls in pipespace_new()

The branch main has been updated by markj:

URL: https://cgit.FreeBSD.org/src/commit/?id=fa77660a3ccbd5f30e88093703b0f93892ef35d7

commit fa77660a3ccbd5f30e88093703b0f93892ef35d7
Author:     Mark Johnston <markj@FreeBSD.org>
AuthorDate: 2026-02-21 16:28:49 +0000
Commit:     Mark Johnston <markj@FreeBSD.org>
CommitDate: 2026-02-21 16:28:49 +0000

    pipe: Avoid unnecessary priv_check() calls in pipespace_new()
    
    Running out of pipe map KVA is a rare case, so reorder checks
    accordingly, presuming that calling priv_check() is more expensive than
    the calculation.  In particular, priv_check() might not be cheap to
    evaluate if MAC hooks are installed.
    
    Reviewed by:    olce, kib
    MFC after:      2 weeks
    Differential Revision:  https://reviews.freebsd.org/D55378
---
 sys/kern/sys_pipe.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sys/kern/sys_pipe.c b/sys/kern/sys_pipe.c
index 6531cea31423..e928de1cd776 100644
--- a/sys/kern/sys_pipe.c
+++ b/sys/kern/sys_pipe.c
@@ -592,8 +592,8 @@ retry:
 	}
 
 	vm_map_lock(pipe_map);
-	if (priv_check(curthread, PRIV_PIPEBUF) != 0 && maxpipekva / 100 *
-	    (100 - pipebuf_reserv) < amountpipekva + size) {
+	if (maxpipekva / 100 * (100 - pipebuf_reserv) < amountpipekva + size &&
+	    priv_check(curthread, PRIV_PIPEBUF) != 0) {
 		vm_map_unlock(pipe_map);
 		chgpipecnt(cpipe->pipe_pair->pp_owner->cr_ruidinfo, -size, 0);
 		if (cpipe->pipe_buffer.buffer == NULL &&