linux-kernel - [PATCH 4.19 031/287] ia64, processor: fix -Wincompatible-pointer-types in ia64_get

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Message-Id: <20220823080101.325562952@linuxfoundation.org>
Date:   Tue, 23 Aug 2022 10:23:20 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, kernel test robot <lkp@...el.com>,
        Alexander Lobakin <alexandr.lobakin@...el.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Yury Norov <yury.norov@...il.com>
Subject: [PATCH 4.19 031/287] ia64, processor: fix -Wincompatible-pointer-types in ia64_get_irr()

From: Alexander Lobakin <alexandr.lobakin@...el.com>

commit e5a16a5c4602c119262f350274021f90465f479d upstream.

test_bit(), as any other bitmap op, takes `unsigned long *` as a
second argument (pointer to the actual bitmap), as any bitmap
itself is an array of unsigned longs. However, the ia64_get_irr()
code passes a ref to `u64` as a second argument.
This works with the ia64 bitops implementation due to that they
have `void *` as the second argument and then cast it later on.
This works with the bitmap API itself due to that `unsigned long`
has the same size on ia64 as `u64` (`unsigned long long`), but
from the compiler PoV those two are different.
Define @irr as `unsigned long` to fix that. That implies no
functional changes. Has been hidden for 16 years!

Fixes: a58786917ce2 ("[IA64] avoid broken SAL_CACHE_FLUSH implementations")
Cc: stable@...r.kernel.org # 2.6.16+
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Alexander Lobakin <alexandr.lobakin@...el.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Reviewed-by: Yury Norov <yury.norov@...il.com>
Signed-off-by: Yury Norov <yury.norov@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/ia64/include/asm/processor.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/ia64/include/asm/processor.h
+++ b/arch/ia64/include/asm/processor.h
@@ -552,7 +552,7 @@ ia64_get_irr(unsigned int vector)
 {
 	unsigned int reg = vector / 64;
 	unsigned int bit = vector % 64;
-	u64 irr;
+	unsigned long irr;
 
 	switch (reg) {
 	case 0: irr = ia64_getreg(_IA64_REG_CR_IRR0); break;