[PATCH] ARM: errata: document Cortex-A9 r4 as affected by erratum 754322

[Qingfang Deng]

The Cortex-A9 r4 Software Developers Errata Notice (ARM UAN 0009D),
section 2.3.3, lists erratum 754322 as affecting all r2, r3 and r4
revisions. The Kconfig help text currently mentions only r2 and r3.

Add r4p* to the affected revisions so that users configuring Cortex-A9
r4 systems know that the workaround also applies to them.

Link: https://documentation-service.arm.com/static/608118675e70d934bc69f143
Fixes: fcbdc5fe6ebe ("ARM: 6772/1: errata: possible fault MMU translations following an ASID switch")
Signed-off-by: Qingfang Deng <qingfang.deng at linux.dev>
---
 arch/arm/Kconfig | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 0cc289a7184a..c7d631d5242b 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -708,11 +708,12 @@ config ARM_ERRATA_754322
 	depends on CPU_V7
 	help
 	  This option enables the workaround for the 754322 Cortex-A9 (r2p*,
-	  r3p*) erratum. A speculative memory access may cause a page table walk
-	  which starts prior to an ASID switch but completes afterwards. This
-	  can populate the micro-TLB with a stale entry which may be hit with
-	  the new ASID. This workaround places two dsb instructions in the mm
-	  switching code so that no page table walks can cross the ASID switch.
+	  r3p*,r4p*) erratum. A speculative memory access may cause a page table
+	  walk which starts prior to an ASID switch but completes afterwards.
+	  This can populate the micro-TLB with a stale entry which may be hit
+	  with the new ASID. This workaround places two dsb instructions in the
+	  mm switching code so that no page table walks can cross the ASID
+	  switch.
 
 config ARM_ERRATA_754327
 	bool "ARM errata: no automatic Store Buffer drain"
-- 
2.43.0