man2/bpf.2: srcfix: Some fixes that only change fonts

1) Use single-font macros for a single argument.

2) Use quotation marks for arguments containing a space.

3) Use roman font for punctuation marks.

  The output has only changes of the font for a punctuation mark.

Signed-off-by: Bjarni Ingi Gislason <bjarniig@rhi.hi.is>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man2/bpf.2

@@ -30,7 +30,7 @@ bpf \- perform a command on an extended BPF map or program
 .nf
 .B #include <linux/bpf.h>
 
-.BI "int bpf(int " cmd ", union bpf_attr *" attr ", unsigned int " size ");
+.BI "int bpf(int " cmd ", union bpf_attr *" attr ", unsigned int " size );
 .fi
 .SH DESCRIPTION
 The
@@ -135,13 +135,13 @@ event A     event B    event C    on eth0     on eth1    on eth2
 The operation to be performed by the
 .BR bpf ()
 system call is determined by the
-.IR cmd
+.I cmd
 argument.
 Each operation takes an accompanying argument,
 provided via
 .IR attr ,
 which is a pointer to a union of type
-.IR bpf_attr
+.I bpf_attr
 (see below).
 The
 .I size
@@ -149,7 +149,7 @@ argument is the size of the union pointed to by
 .IR attr .
 .PP
 The value provided in
-.IR cmd
+.I cmd
 is one of the following:
 .TP
 .B BPF_MAP_CREATE
@@ -243,7 +243,7 @@ The following wrapper functions demonstrate how various
 .BR bpf ()
 commands can be used to access the maps.
 The functions use the
-.IR cmd
+.I cmd
 argument to invoke different operations.
 .TP
 .B BPF_MAP_CREATE
@@ -302,7 +302,7 @@ and to check that the program doesn't access the map element
 beyond the specified
 .IR value_size .
 For example, when a map is created with a
-.IR key_size
+.I key_size
 of 8 and the eBPF program calls
 .IP
 .in +4n
@@ -321,7 +321,7 @@ since the in-kernel helper function
 expects to read 8 bytes from the location pointed to by
 .IR key ,
 but the
-.IR "fp\ -\ 4"
+.I fp\ -\ 4
 (where
 .I fp
 is the top of the stack)
@@ -527,7 +527,7 @@ The
 command looks up an element by
 .I key
 in the map referred to by the file descriptor
-.IR fd
+.I fd
 and sets the
 .I next_key
 pointer to the key of the next element.
@@ -642,7 +642,7 @@ fashion;
 for atomic updates, a hash-table map should be used instead.
 There is however one special case that can also be used with arrays:
 the atomic built-in
-.BR __sync_fetch_and_add()
+.B __sync_fetch_and_add()
 can be used on 32 and 64 bit atomic counters.
 For example, it can be
 applied on the whole value itself if it represents a single counter,
@@ -881,7 +881,7 @@ argument is a pointer to a
 .\" the program can now access skb fields.
 .\"
 .TP
-.BR BPF_PROG_TYPE_KPROBE " (since Linux 4.1)
+.BR BPF_PROG_TYPE_KPROBE " (since Linux 4.1)"
 .\" commit 2541517c32be2531e0da59dfd7efc1ce844644f5
 [To be documented]
 .\" FIXME Document this program type
@@ -890,7 +890,7 @@ argument is a pointer to a
 .\"
 .\" FIXME We need text here to describe 'kern_version'
 .TP
-.BR BPF_PROG_TYPE_SCHED_CLS " (since Linux 4.1)
+.BR BPF_PROG_TYPE_SCHED_CLS " (since Linux 4.1)"
 .\" commit 96be4325f443dbbfeb37d2a157675ac0736531a1
 .\" commit e2e9b6541dd4b31848079da80fe2253daaafb549
 [To be documented]
@@ -898,7 +898,7 @@ argument is a pointer to a
 .\"	  Describe allowed helper functions for this program type
 .\"	  Describe bpf_context for this program type
 .TP
-.BR BPF_PROG_TYPE_SCHED_ACT " (since Linux 4.1)
+.BR BPF_PROG_TYPE_SCHED_ACT " (since Linux 4.1)"
 .\" commit 94caee8c312d96522bcdae88791aaa9ebcd5f22c
 .\" commit a8cb5f556b567974d75ea29c15181c445c541b1f
 [To be documented]
@@ -1009,7 +1009,7 @@ main(int argc, char **argv)
 .EE
 .PP
 Some complete working code can be found in the
-.IR samples/bpf
+.I samples/bpf
 directory in the kernel source tree.
 .SH RETURN VALUE
 For a successful call, the return value depends on the operation:
@@ -1028,14 +1028,14 @@ On error, \-1 is returned, and
 is set appropriately.
 .SH ERRORS
 .TP
-.BR E2BIG
+.B E2BIG
 The eBPF program is too large or a map reached the
 .I max_entries
 limit (maximum number of elements).
 .TP
-.BR EACCES
+.B EACCES
 For
-.BR BPF_PROG_LOAD,
+.BR BPF_PROG_LOAD ,
 even though all program instructions are valid, the program has been
 rejected because it was deemed unsafe.
 This may be because it may have
@@ -1079,7 +1079,7 @@ or attributes are invalid.
 .TP
 .B EINVAL
 For
-.BR BPF_MAP_*_ELEM
+.B BPF_MAP_*_ELEM
 commands,
 some of the fields of
 .I "union bpf_attr"
@@ -1088,13 +1088,13 @@ are not set to zero.
 .TP
 .B EINVAL
 For
-.BR BPF_PROG_LOAD,
+.BR BPF_PROG_LOAD ,
 indicates an attempt to load an invalid program.
 eBPF programs can be deemed
 invalid due to unrecognized instructions, the use of reserved fields, jumps
 out of range, infinite loops or calls of unknown functions.
 .TP
-.BR ENOENT
+.B ENOENT
 For
 .B BPF_MAP_LOOKUP_ELEM
 or
@@ -1166,7 +1166,7 @@ Normal compilation.
 Debugging mode.
 The generated opcodes are dumped in hexadecimal into the kernel log.
 These opcodes can then be disassembled using the program
-.IR tools/net/bpf_jit_disasm.c
+.I tools/net/bpf_jit_disasm.c
 provided in the kernel source tree.
 .PP
 Since Linux 4.15,