From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dan Carpenter Date: Sat, 17 Nov 2012 15:16:11 +0000 Subject: [patch] x86, UV: integer wrap bug in uv_hub_ipi_value() Message-Id: <20121117151611.GB16900@elgon.mountain> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Thomas Gleixner , Jack Steiner , Dimitri Sivanich Cc: Ingo Molnar , "H. Peter Anvin" , x86@kernel.org, Russ Anderson , linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org This is a static checker fix. The problem is that we store the bits from "uv_apicid_hibits" into "apicid" (the high 16 bits) but then we shift it 16 bit to the left. "apicid" is an int so it wraps and we lose them. Signed-off-by: Dan Carpenter --- This is for an SGI product, and I can't test it. diff --git a/arch/x86/include/asm/uv/uv_hub.h b/arch/x86/include/asm/uv/uv_hub.h index 21f7385..f3a0f91 100644 --- a/arch/x86/include/asm/uv/uv_hub.h +++ b/arch/x86/include/asm/uv/uv_hub.h @@ -573,7 +573,7 @@ static inline void uv_set_cpu_scir_bits(int cpu, unsigned char value) } extern unsigned int uv_apicid_hibits; -static unsigned long uv_hub_ipi_value(int apicid, int vector, int mode) +static unsigned long uv_hub_ipi_value(ulong apicid, ulong vector, ulong mode) { apicid |= uv_apicid_hibits; return (1UL << UVH_IPI_INT_SEND_SHFT) | diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c index 8cfade9..6d93b2f 100644 --- a/arch/x86/kernel/apic/x2apic_uv_x.c +++ b/arch/x86/kernel/apic/x2apic_uv_x.c @@ -194,13 +194,13 @@ static int __cpuinit uv_wakeup_secondary(int phys_apicid, unsigned long start_ri pnode = uv_apicid_to_pnode(phys_apicid); phys_apicid |= uv_apicid_hibits; val = (1UL << UVH_IPI_INT_SEND_SHFT) | - (phys_apicid << UVH_IPI_INT_APIC_ID_SHFT) | + ((unsigned long)phys_apicid << UVH_IPI_INT_APIC_ID_SHFT) | ((start_rip << UVH_IPI_INT_VECTOR_SHFT) >> 12) | APIC_DM_INIT; uv_write_global_mmr64(pnode, UVH_IPI_INT, val); val = (1UL << UVH_IPI_INT_SEND_SHFT) | - (phys_apicid << UVH_IPI_INT_APIC_ID_SHFT) | + ((unsigned long)phys_apicid << UVH_IPI_INT_APIC_ID_SHFT) | ((start_rip << UVH_IPI_INT_VECTOR_SHFT) >> 12) | APIC_DM_STARTUP; uv_write_global_mmr64(pnode, UVH_IPI_INT, val);