On 9/4/26 14:44, Ard Biesheuvel wrote:

On Fri, 4 Sep 2026, at 04:06, Hui Wang wrote:
The previous mail was rejected by linux-kselftest maillist because the
html part is detected. Fixing it and re-sending the mail.

On 9/3/26 17:34, Ard Biesheuvel wrote:
   run_test()
@@ -74,7 +82,7 @@ test_create_empty()
   {
        local file=$efivarfs_mount/$FUNCNAME-$test_guid

-       : > $file
+       : 2>/dev/null > $file

Why is this needed?
The test_create_empty() will be run on read-only efivarfs, and it will
print [PASS], but it will also print some noise message with read-only
filesystem like:

--------------------
running test_create_empty
--------------------
$(TESTCASE_PATH)/efivarfs.sh: line 85:
/sys/firmware/efi/efivars/test_create_empty-210be57c-9849-4fc7-a635-e6382d1aec27:
Read-only file system
    [PASS]

This change is for suppressing the noise message and make the output
clean like below:

--------------------
running test_create_empty
--------------------
    [PASS]

That does not make sense.

If the file does not exist after attempting to create it, the test has failed.
But I suspect that this fails even on a read-write efivarfs, given that EFI
does not support zero-length variables.

Please fix this in a separate patch, or leave it alone. Don't paper over it
like this.

OK, got it.

Thanks.


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