Add MADV_POPULATE_READ and MADV_POPULATE_WRITE from Linux 5.14 to bits/mman-linux.h

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State New
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  • Add MADV_POPULATE_READ and MADV_POPULATE_WRITE from Linux 5.14 to bits/mman-linux.h
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Commit Message

Joseph Myers Sept. 7, 2021, 9:24 p.m.
Linux 5.14 adds constants MADV_POPULATE_READ and MADV_POPULATE_WRITE
(with the same values on all architectures).  Add these to glibc's
bits/mman-linux.h.

Tested for x86_64.


-- 
Joseph S. Myers
joseph@codesourcery.com

Comments

H.J. Lu via Libc-alpha Sept. 13, 2021, 5:41 p.m. | #1
Joseph Myers <joseph@codesourcery.com> writes:
> +# define MADV_POPULATE_READ 22	/* Populate (prefault) page tables

> +				   readable.  */

> +# define MADV_POPULATE_WRITE 23	/* Populate (prefault) page tables

> +				   writable.  */


Confirmed that these are the correct values across all arch's in the
linux source tree.

Reviewed-by: DJ Delorie <dj@redhat.com>

Patch

diff --git a/sysdeps/unix/sysv/linux/bits/mman-linux.h b/sysdeps/unix/sysv/linux/bits/mman-linux.h
index 3b1ae418e0..31451c28d9 100644
--- a/sysdeps/unix/sysv/linux/bits/mman-linux.h
+++ b/sysdeps/unix/sysv/linux/bits/mman-linux.h
@@ -89,6 +89,10 @@ 
 # define MADV_KEEPONFORK  19	/* Undo MADV_WIPEONFORK.  */
 # define MADV_COLD        20	/* Deactivate these pages.  */
 # define MADV_PAGEOUT     21	/* Reclaim these pages.  */
+# define MADV_POPULATE_READ 22	/* Populate (prefault) page tables
+				   readable.  */
+# define MADV_POPULATE_WRITE 23	/* Populate (prefault) page tables
+				   writable.  */
 # define MADV_HWPOISON	  100	/* Poison a page for testing.  */
 #endif