[PATCH v2] getauxval.3: MIPS, AT_BASE_PLATFORM passes ISA level

[YunQiang Su]

Since Linux 5.7, on MIPS, we use AT_BASE_PLATFORM to pass ISA level.
The values may be:
  mips2, mips3, mips4, mips5,
  mips32, mips32r2, mips32r6,
  mips64, mips64r2, mips64r6.

This behavior is different with PowerPC.

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=e585b768da111f2c2d413de6214e83bbdfee8f22
Signed-off-by: YunQiang Su <syq@xxxxxxxxxx>

----
v1 -> v2: fix typo
---
 man3/getauxval.3 | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/man3/getauxval.3 b/man3/getauxval.3
index 456371c6a..bcc116dd2 100644
--- a/man3/getauxval.3
+++ b/man3/getauxval.3
@@ -60,9 +60,10 @@ values are present on all architectures.
 The base address of the program interpreter (usually, the dynamic linker).
 .TP
 .BR AT_BASE_PLATFORM
-A pointer to a string identifying the real platform; may differ from
-.BR AT_PLATFORM
-(PowerPC only).
+A pointer to a string (PowerPC and MIPS only).
+On PowerPC, this identifies the real platform; may differ from
+.BR AT_PLATFORM "."
+On MIPS, this identifies the ISA level (Since 5.7).
 .TP
 .BR AT_CLKTCK
 The frequency with which
-- 
2.26.0.rc2