linux-kernel - [PATCH] hamradio: baycom_epp: Do not use x86-specific rdtsc()

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Date:   Sun, 18 Dec 2022 13:04:05 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Thomas Sailer <t.sailer@...mni.ethz.ch>
Cc:     linux-hams@...r.kernel.org, netdev@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] hamradio: baycom_epp: Do not use x86-specific rdtsc()

From: "Borislav Petkov (AMD)" <bp@...en8.de>

Use get_cycles() which is provided by pretty much every arch.

The UML build works too because get_cycles() is a simple "return 0;"
because the rdtsc() is optimized away there.

Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
---
 drivers/net/hamradio/baycom_epp.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/net/hamradio/baycom_epp.c b/drivers/net/hamradio/baycom_epp.c
index bd3b0c2655a2..83ff882f5d97 100644
--- a/drivers/net/hamradio/baycom_epp.c
+++ b/drivers/net/hamradio/baycom_epp.c
@@ -623,16 +623,10 @@ static int receive(struct net_device *dev, int cnt)
 
 /* --------------------------------------------------------------------- */
 
-#if defined(__i386__) && !defined(CONFIG_UML)
-#include <asm/msr.h>
 #define GETTICK(x)						\
 ({								\
-	if (boot_cpu_has(X86_FEATURE_TSC))			\
-		x = (unsigned int)rdtsc();			\
+	x = (unsigned int)get_cycles();				\
 })
-#else /* __i386__  && !CONFIG_UML */
-#define GETTICK(x)
-#endif /* __i386__  && !CONFIG_UML */
 
 static void epp_bh(struct work_struct *work)
 {
-- 
2.35.1